Question : Error occuring on Websphere server start up in Log4J

I am receiving these two error messages on my WebSphere 6.1 server:

[4/23/08 10:34:03:543 EDT] 00000017 SystemErr     R log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
[4/23/08 10:34:03:543 EDT] 00000017 SystemErr     R log4j:WARN Please initialize the log4j system properly.

After Googling some about this problem and checking Experts-Exchange Knowledge Base a bit, it probably is related to the log4j.properties file or log4j.xml properties in some way.  I had two instances of this message occurring last week but by putting a properties file in the classpath I did away with one pair.  So I went from two pair to one pair.  Can anyone tell me how to solve this problem?

Thank you for any help you can give me.

Answer : Error occuring on Websphere server start up in Log4J

What are you using currently - properties or xml?